9. Driver versions

Due to the introduction of loadable drivers in an upcoming XFree86 release, it
has become necessary to track driver versions separately.
With this release of the driver, I am introducing the following version
numbering scheme.

Version 1 of this driver is the one I inherited from Rik Faith.
This is the version found in XFree86 2.0 and 2.1.

Version 2 is my first rewrite of this code which only ended up being a
partially unsuccessful attempt at generalizing the driver for all VGA Wonder,
Mach32, and early Mach64 adapters.
Various releases of this version of the driver can be found in XFree86 2.1.1,
3.1, 3.1.1 and 3.1.2.

Version 3 represents my second rewrite (although a rather lame one as rewrites
go).
Into version 3, I introduced clock programming for Mach64 adapters and merged
in the old ati_test debugging tool.
This is the version found in XFree86 3.2, 3.3 and 3.3.1.

Version 4 is a rather major restructuring of version 3, which became larger
than I could comfortably handle in one source file.
This version will make it quite a bit easier to introduce new function such as
acceleration, additional colour depths, and so on.
This is the version found in XFree86 3.3.2, 3.3.3, 3.3.3.1, 3.3.3.2,
3.3.4, 3.3.6 and 3.3.6.